I've seen some similar issues posted...but still can't get this to work. The situation is pretty simple.
LAN Network: 192.168.0.0-192.168.0.255
Secondary LAN Network: 192.168.1.0-192.168.1.255
Secondary LAN reachable through internal router at 192.168.0.15
I add in the secondary network as SecondaryLAN, a separate internal network. I created network rule that is a route between internal and SecondaryLAN. I added firewall rules allowing traffic between SecondaryLAN and Localhost and a separate rule for traffic between SecondaryLAN and Internal. I added a route for secondaryLAN to 192.168.0.15 (route added in TMG, not route add).
I still get traffic blocked to 192.168.1.x. Traffic in the logs is reported as Denied - dropped due to unreachable network.
Any suggestions?